选择题:18— Have you ever been to the Great Wall in Beijin

题目内容:
18— Have you ever been to the Great Wall in Beijing?
—____________ ( )(本题5.0分)
A、 Yes, I am .
B、 No, I don.t.
C、 No, I.ve never been there.
D、 Certainly, I went there.
参考答案:

6. 如果一正常染色体上基因的序列以ABCDEFG字母顺序代表,现有染色体结构为:ABEDCFG,此

6. 如果一正常染色体上基因的序列以ABCDEFG字母顺序代表,现有染色体结构为:ABEDCFG,此种结构改变属于( )(本题2.0分)A. 缺失B. 易位C.

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